Asian stocks sagged on Monday after top Federal Reserve officials kept the door open for an interest rate hike in September and investors braced for China economic data this week. Fed Vice Chairman Stanley Fischer, speaking at the central bank’ conference in Jackson Hole, Wyoming, said recent volatility in global markets could ease and possibly pave the way for a rate hike. St. Louis Fed President James Bullard also said he still favored hiking rates next month, though he added that his colleagues would be hesitant to do so if global markets continued to be volatile into mid-September.